Command line parsing warnings

[bneradt]

Fei noticed that this generates now warning:

./verifier-client run ./replay ${ts_ip}:80,${ts_ip}:81,${ts_ip}:82,${ts_ip}:83,${ts_ip}:8080 ${ts_ip}:443,${ts_ip}:444,${ts_ip}:445,${ts_ip}:446,${ts_ip}:4443 --rate 4000--repeat 10

Note: --rate 4000--repeat 10 doesn't have a space between 4000 and --repeat. The client simply winds up ignoring the repeat argument and silently continues without a warning. It would be nice if it warned or simply failed to execute with this.